A.O. Smith
Hydrogen Sulfide Odor Reaction
A.O. Smith water heater emits a rotten egg or sulfur smell from hot water taps
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Reaction between magnesium anode rod and sulfur bacteria, High sulfate content in water, Stagnant water in tank
How to Fix / Troubleshooting
Safety: Odor is usually not dangerous but can be unpleasant. If you suspect gas leaks, treat separately.
- 1. Flush tank: Drain and flush the tank thoroughly to remove stagnant water.
- 2. Disinfect system: Follow A.O. Smith or plumbing guidelines to chlorinate the tank and plumbing to kill sulfur bacteria.
- 3. Replace anode rod: Consider replacing the magnesium anode rod with an aluminum/zinc alloy anode designed to reduce odor.
- 4. Raise temperature temporarily: Temporarily increasing water temperature (with caution) can help kill bacteria; then return to a safe setpoint.
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Repair Difficulty
Medium
3/5
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